Sam2 is correct according to the Rambam, Ramban, Minchas Chinuch, and most other Rishonim. Classifying something as a “mitzvah” is a dangerous business, and the Rambam wrote several shorashim on them. To be mlamed zchus to those who think shanim mikrah is a mitzvah, the Bihag does classify various d’rabbanans as mitzvos (though I am nearly sure he did not include shnaim mikrah) in his hakdama to the Bihag, so at least there is some Rishon (though the Rambam and Ramban in shoresh sheni in Sefer Hamitzvos both attack him for doing so) that thinks dirabbanans can be classified as a mitzvah.
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